ConnectedLogFile::writeln writes a line by sending a Message.
ConnectedLogFile::writeln now throws an exception if the send Message fails.
Fixed warning about unused argument
Added constructor to UnableToConnectError taking an extra message.
Implmented parts of the HostConnectionFactory.
The SessionConnection sends Deliverables and receives Receivables.
It is now possible to listen to when a DummySocket is killed.
DefaultConnection now holds on to socket.